.\"
.\" Copyright (c) Mark J. Kilgard, 1996.
.\"
.\" See the file "man/LICENSE" for information on usage and redistribution
.\"
.TH glutDialsFunc 3 "April 2025" "freeglut" "freeglut"
.SH NAME
glutDialsFunc - sets the dial & button box dials callback for the current window.
.SH SYNTAX
.nf
.LP
void glutDialsFunc(void (*func)(int dial, int value));
.fi
.SH ARGUMENTS
.IP \fIfunc\fP 1i
The new dials callback function.
.SH DESCRIPTION
glutDialsFunc sets the dial & button box dials callback for the
current window. The dial & button box dials callback for a window is
called when the window has dial & button box input focus (normally,
when the mouse is in the window) and the user generates dial & button
box dial changes. The dial parameter will be the dial number (starting
at one). The number of available dial & button box dials can be
determined with glutDeviceGet(GLUT_NUM_DIALS). The value
measures the absolute rotation in degrees. Dial values do not ``roll over''
with each complete rotation but continue to accumulate degrees (until the
int dial value overflows).

Registering a dial & button box dials callback when a dial & button box
device is not available is ineffectual and not an error. In this case, no dial
& button box dials callbacks will be generated.

Passing NULL to glutDialsFunc disables the generation of dial &
button box dials callbacks. When a new window is created, no dial &
button box dials callback is initially registered.
.SH SEE ALSO
glutButtonBoxFunc, glutDeviceGet
.SH AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
